Melanotan 1 (MT 1) UK Research Peptide Peptides Lab UK Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and MELANOTAN II (MT 2) VIAL, (10MG) High Purity Peptide Pure Bio Labs Melanotan 1 and Melanotan 2 are peptides that boost melanin to darken your skin without the sun. Melanotan 1 is FDA approved for rare light sensitivity conditions and gives a more gradual and even tan